2016/05/06 by A. Yahalom · 1 citation
Physics and Astronomy · #physics.plasm-ph
paper · pdf · doi:10.1080/03091929.2017.1281410
3 pages. arXiv admin note: text overlap with arXiv:1510.00637
arxiv created 2016/05/06 · arxiv updated 2017/04/12
Cross helicity is not conserved in non-barotropic magnetohydrodynamics (MHD) (as opposed to barotropic or incompressible MHD). Here we show that variational analysis suggests a new kind of cross helicity which is conserved in the non barotropic case. The non barotropic cross helicity reduces to the standard cross helicity under barotropic assumptions. The new cross helicity is conserved even for topologies for which the variational principle does not apply.